Processing of Pet-Silver Nanocomposite Filaments

2016 ◽  
Vol 869 ◽  
pp. 350-355 ◽  
Author(s):  
Marcos Antônio Guerra ◽  
Neide Aparecida Mariano ◽  
Alfeu Saraiva Ramos ◽  
Maria Gabriela Nogueira Campos
Keyword(s):  
Chemical Resistance ◽  
Thermal Analyses ◽  
Crystalline Polymer ◽  
Industrial Applications ◽  
Homogeneous Distribution ◽  
Rheological Characterization ◽  
Silver Nanocomposite ◽  
Fiber Processing ◽  
Master Batch ◽  
Excellent Chemical

Nanoparticles play a fundamental role on nanocomposite properties, as they significantly increase the contact area and allow a homogeneous distribution in comparison to microparticles. Silver nanoparticles (AgNP) have been extensively used in biomedical and engineering applications due to their interesting properties, such as antibacterial activity. Polyethylene terephthalate (PET) is a semi-crystalline polymer and has excellent chemical resistance and thermal stability. Because of its remarkable properties, PET has been used in several industrial applications, such as packaging, electrical, automotive, construction and textile. The aim of this study was to prepare potential antimicrobial PET-AgNP nanocomposite filaments for textile applications. Therefore, AgNP were incorporated in the PET matrix at different concentrations (0.05; 0.10; 0.15; 0.20; 0.25; 0.30; 0.35 and 0.40%) by extruding the PET resin with specific amounts of a 10% (w/w) AgNP/PET master batch. Then, rheological characterization was carried out and filaments were produced for mechanical, optical and thermal analyses. The incorporation of up to 0.20% (w/w) of AgNP in the polymeric matrix has not significantly altered overall properties of PET nanocomposites. Moreover, the nanocomposite incorporated with 0.05% of AgNP demonstrated suitable intrinsic viscosity for fiber processing and PET-like mechanical, thermal and optical properties.

Oxa-Michael polyaddition of vinylsulfonylethanol for aliphatic polyethersulfones

2021 ◽  
Author(s):  
Nicole Ziegenbalg ◽  
Ruth Lohwasser ◽  
Giovanni D’Andola ◽  
Torben Adermann ◽  
Johannes Christopher Brendel
Keyword(s):  
Refractive Index ◽  
High Temperature ◽  
Flame Retardant ◽  
Chemical Resistance ◽  
High Refractive Index ◽  
Industrial Applications ◽  
Interesting Class ◽  
The Common ◽  
Flame Retardant Properties

Polyethersulfones are an interesting class of polymers for industrial applications due to their unusual properties such as a high refractive index, flame-retardant properties, high temperature and chemical resistance. The common...

scholarly journals Development, characterization and stability of microemulsionated formulations of bacaba, Oenocarpus bacaba oil

2019 ◽  
Vol 49 (3) ◽  
pp. 246-255
Author(s):  
Maycon de Paula Ribeiro TORRES ◽  
Rhuan Vínicius de Freitas ESPRENDOR ◽  
Solange Maria BONALDO ◽  
Elton Brito RIBEIRO ◽  
Dênia Mendes de Sousa VALLADÃO
Keyword(s):  
Antioxidant Activity ◽  
Natural Products ◽  
Droplet Diameter ◽  
Radical Scavenging ◽  
Industrial Applications ◽  
Research Field ◽  
Hydrodynamic Diameter ◽  
Amazon Forest ◽  
Formulation Development ◽  
Rheological Characterization

ABSTRACT Advances in nanotechnology, combined with the use of natural products, represent a promissing research field. Brazil is a country of a rich biodiversity, especially in the Amazon forest. Fruits commonly used by local communities, such as bacaba (Oenocarpus bacaba), are potentially important for prospection of industrial applications of natural products. In nanotechnology, microemulsions stand out for providing a modified release to conveyed substances. This work aimed to develop microemulsionated formulations of bacaba oil, characterize them and evaluate their stability. We determined the HLB (hydrophile-lipophilic balance) of bacaba oil for formulation development. Six formulations were selected from pseudoternary diagrams, which indicated the proportions of surfactants, aqueous phase and bacaba oil. The viability of these formulations was evaluated through stability tests. We provided the rheological characterization of the formulations, evaluated their potential antioxidant activity through the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging method, and determined the hydrodynamic diameter of the droplets. The microemulsions were stable throughout the test period. Droplet diameter was below 200 nm, and the microemulsions were characterized as newtonian fluids, presenting an increase in antioxidant activity when compared with the diluted oil. Our results confirm the potential of bacaba oil in microemulsionated formulation as a suitable carrier for active compounds.

Corrosion of Glazes Coated with Functional Films in Detergent Solutions

2006 ◽  
Vol 45 ◽  
pp. 156-161 ◽  
Author(s):  
Minna Piispanen ◽  
Linda Fröberg ◽  
Thomas Kronberg ◽  
Sami Areva ◽  
Leena Hupa
Keyword(s):  
Surface Roughness ◽  
Everyday Life ◽  
Surface Topography ◽  
Chemical Resistance ◽  
Sol Gel ◽  
Optical Microscope ◽  
Alkaline Environments ◽  
Zirconia Films ◽  
Excellent Chemical ◽  
Detergent Solutions

The goal of this work was to establish the compatibility of mat glazes with functional films known to render the surfaces with self-cleaning or easy-to-clean properties. Glazes with wollastonite, pseudowollastonite, diopside and zircon as the main crystalline phases in the surfaces were coated with fluoropolymer as well as ceramic, sol-gel derived titania and zirconia films. The glazes were soaked in typical detergent solutions used in everyday life up to four days. The surface roughness was measured with confocal optical microscope and the surface was imaged and analyzed with SEM/EDXA. When applied on wollastonite and pseudowollastonite containing glazes the functional films readily reacted in water solutions by pitting of the surface in the vicinity of the crystals. The ceramic titania and zirconia films showed better chemical resistance on wollastonite –free glazes, while the fluoropolymer film corroded in the most alkaline environments. The results indicate that functional films could be used also on rough surfaces without markedly affecting the surface topography. However, the films should be applied only on glazes with an excellent chemical resistance.

Electron Beam Surface Engineering of Spray-Formed Aluminium-Silicon Alloys

2011 ◽  
Vol 690 ◽  
pp. 79-82 ◽  
Author(s):  
Rolf Zenker ◽  
Marco Klemm ◽  
Anja Buchwalder
Keyword(s):  
Surface Engineering ◽  
Construction Materials ◽  
Industrial Applications ◽  
Beam Deflection ◽  
Wear Behaviour ◽  
Homogeneous Distribution ◽  
Silicon Alloys ◽  
Beam Surface ◽  
Microstructure Characteristic ◽  
Very High

Aluminium alloys are commonly used lightweight construction materials. Spray-formed alloys, in particular, represent a group of materials with very high Si contents and a homogeneous distribution of primary Si and other alloying elements in solid solution and intermetallic compounds. The paper deals with current results of EB surface alloying and dispersing of such alloys using a high frequency beam deflection technique. The results concerning the interactions between the EB and the material and its effects on the layer microstructure, characteristic layer properties as well as detailed researches into friction and wear behaviour and future prospects for the technological transferability to industrial applications will be discussed.

scholarly journals Evaluation of Dynamic Materials Procured from Waste Biomass

2011 ◽  
Vol 2011 ◽  
pp. 1-7
Author(s):  
Ashish Chauhan ◽  
Balbir Kaith
Keyword(s):  
Moisture Absorption ◽  
Chemical Resistance ◽  
Phenol Formaldehyde ◽  
Graft Copolymers ◽  
Ethyl Acrylate ◽  
Industrial Applications ◽  
Modulus Of Rupture ◽  
Waste Biomass ◽  
Dynamic Materials ◽  
Physico Chemical

Methyl acrylate (MA) monomer was graft copolymerized onto Hibiscus sabdariffa stem fiber and used to explore the additive effect of vinyl acrylate (VA) and ethyl acrylate (EA) on percentage grafting and the properties of the fiber, in binary vinyl monomeric mixtures. The graft copolymers were reinforced into phenol-formaldehyde polymer matrix to form biocomposites and characterized by FTIR, XRD, TGA, DTA, and SEM techniques. They were evaluated for physico-chemical changes in properties like moisture absorption at different relative humidity levels and chemical resistance against 1 N NaOH and 1 N HCl. These graft copolymers-reinforced biocomposites had higher mechanical strength like hardness, modulus of rupture, modulus of elasticity, and stress at the limit of proportionality. These novel materials can have numerous scientific and industrial applications for the development of technology.

Development of Polyamide 6/Ferrite Composites for Absorbers of Electromagnetic Radiation

2010 ◽  
Vol 660-661 ◽  
pp. 922-927 ◽  
Author(s):  
Daniella Cibele Bezerra ◽  
Taciana Regina de Gouveia Silva ◽  
Edcleide Maria Araújo ◽  
Renê Anísio da Paz ◽  
Ana Cristina Figueiredo de Melo Costa
Keyword(s):  
Chemical Composition ◽  
Electromagnetic Radiation ◽  
Dimensional Stability ◽  
Chemical Resistance ◽  
Polyamide 6 ◽  
Good Resistance ◽  
Ferrite Composites ◽  
Excellent Chemical

Composites consist of a mixture or combination of the two or more, micro or macro constituents that differ in shape and chemical composition and, in essence, are insoluble in one another. The polyamide is a polymer that presents dimensional stability, good resistance to impact without notch and excellent chemical resistance. Already the ferrites are absorbers of electromagnetic radiation and have versatility to be used as a composite of ferrites. The composite of polyamide6/ferrite was obtained by mixing 10 and 30wt.% of ferrite added to polyamide 6 in a Torque Rheometer Haake. The objective of this work was to develop of polyamide6/ferrite composites to be used as absorbers of electromagnetic radiation. The results were very promising and showed that occurs interaction between the ferrite and polyamide6.

Robust superhydrophobic mesh with excellent chemical resistance for separation of complicated boiling water/oil mixtures

2019 ◽  
Vol 6 (8) ◽  
pp. 085025
Author(s):  
Xinjuan Zeng ◽  
Kangquan Yang ◽  
Kai Yang ◽  
Shouping Xu ◽  
Mengyi Xu ◽  
...  
Keyword(s):  
Chemical Resistance ◽  
Boiling Water ◽  
Oil Mixtures ◽  
Excellent Chemical

scholarly journals Mechanical and Thermal Analyses of Metal-PLA Components Fabricated by Metal Material Extrusion

Inventions ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 44 ◽  
Author(s):  
Mahdi Mohammadizadeh ◽  
Hao Lu ◽  
Ismail Fidan ◽  
Khalid Tantawi ◽  
Ankit Gupta ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Thermal Analyses ◽  
Microstructural Analysis ◽  
Industrial Applications ◽  
Mechanical And Thermal Properties ◽  
Aluminum Powders ◽  
Material Extrusion ◽  
Metal Material ◽  
Wide Range ◽  
Metallic Parts

Metal additive manufacturing (AM) has gained much attention in recent years due to its advantages including geometric freedom and design complexity, appropriate for a wide range of potential industrial applications. However, conventional metal AM methods have high-cost barriers due to the initial cost of the capital equipment, support, and maintenance, etc. This study presents a low-cost metal material extrusion technology as a prospective alternative to the production of metallic parts in additive manufacturing. The filaments used consist of copper, bronze, stainless steel, high carbon iron, and aluminum powders in a polylactic acid matrix. Using the proposed fabrication technology, test specimens were built by extruding metal/polymer composite filaments, which were then sintered in an open-air furnace to produce solid metallic parts. In this research, the mechanical and thermal properties of the built parts are examined using tensile tests, thermogravimetric, thermomechanical and microstructural analysis.

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